Svelte 컴포넌트를 제외한 파일, 폴더 및 라우팅 경로의 이름을 kebab-case로 통일하고 import 경로에 실제 파일 확장자를 사용하도록 변경

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/lib/server/services/category.ts

@@ -1,7 +1,7 @@
-import { CategoryRepo, FileRepo } from "#lib/server/db/index.js";
-import type { Ciphertext } from "#lib/server/db/schema/index.js";
-import { AppError } from "#lib/server/errors.js";
-import { ensureFreshDekVersion } from "./common";
+import { CategoryRepo, FileRepo } from "#lib/server/db/index.ts";
+import type { Ciphertext } from "#lib/server/db/schema/index.ts";
+import { AppError } from "#lib/server/errors.ts";
+import { ensureFreshDekVersion } from "./common.ts";
 
 export const getCategory = async (userId: number, categoryId: CategoryId, recurse: boolean) => {
   const category =